Russia's central bank said it has no grounds to open a local probe into possible currency manipulation after U.S. prosecutors expanded an investigation to include the ruble.

Trading information used in the U.S. probe “has no relation to the Russian market,” Sergey Shvetsov, first deputy governor of Bank of Russia, who oversees financial markets, said in an interview.

U.S. prosecutors have expanded their probe of currency-market manipulation by some of the world's largest banks to include the ruble and Brazilian real, two people familiar with the matter said last month. The Justice Department is using cooperation agreements it reached with banks in May to gather information and interview traders about suspected market rigging, said the people, who asked not to be named because the investigation is confidential.

–With assistance from Tom Schoenberg and Silla Brush in Washington.

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